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Some of the interesting general interest articles, and some support documents that are hosted at or referenced in articles specific to their areas of interest.

  • Accessory Cases: Suggestions by Company Seven article explaining why accessory carrying cases are an important aid to organizing the numerous pieces and parts that will be associated with a telescope. Includes a discussion with illustrations of cases we do recommend, and some dont's too.

  • Astronomy Associations, Clubs, and Societies in the Baltimore-Washington Region

  • Binocular Care And Service Interval Advice: Suggestions by Company Seven. An illustrated overview discussing the mechanisms that compromise the performance or longevity of binoculars. We provide some tips about preventive maintenance, identifying problems, and what to do when your binocular is damage or in need of servicing.

  • "Carl Zeiss - A History Of A Most Respected Name In Optics" This illustrated article is one of the older articles at, with some of the earliest content written here. With some of this content dating back to 1994 when slow dial-up Internet access was common, the article was text heavy because illustrations were by necessity kept to a minimum. Over the decades we have and will on occasion add this or that illustration of items in our museum collection to break up the monotony of text, or make corrections (with much gratitude to contributors), clarify and expand information about content as we pull more information from our own archives. It was never our intent to write a comprehensive and all encompassing history of Zeiss, that would require volumes to do it justice, but rather to show why we at Company Seven were and remain in awe of the company achievements.

  • "Choosing a Telescope: Advice for Anyone Seeking to Buy A Telescope" Please Read This Before Shopping for A Telescope This illustrated article is a most informative and frank discussion about selecting an astronomical telescope from among those commonly available to the consumer. We explain the different types of telescope optical tubes and mounts, how to choose them, and information about how they are marketed. Revised December 2010.

  • Cleaning Most Consumer Optics a short "how to" addressing common concerns about cleaning binoculars, telescopes, filters, and other optical accessories.

  • Company Seven A brief early history of the company with a discussion of philosophy of the company. Also includes discussions of how the industry was changing and what was possible as the Internet was just becoming available to the public. This is taken from an interview with the founder of Company Seven from 1996. Includes and old photo of one of our early gatherings.

  • Company Seven And The NASA International Halley Watch Large Scale Phenomena Network In 1984 Company Seven was approached by NASA to provide several specialized imaging telescopes with a plan to build a world wide network to continuously document the visit of Comet Halley in 1986. The results of our collaboration are now a small part of science history described in this article.

  • Company Seven In NASA STS-61 First Hubble Space Telescope Servicing Mission Illustrated article explaining the Hubble Space Telescope history and reasons for the First Hubble Space Telescope Servicing Mission. The article focuses on the experience of a member on that team from Company Seven, trying to give a not too technical insight into what it was like to participate on this project.

  • Company Seven Modified Pentax 6x7 cm Camera Operation Instructions for use.

  • Computer Controlled Telescopes Advice for those considering the purchase of "Computer Controlled" Telescopes. Includes information about what they are, how the various types work, their pros and cons.

  • Criterion RV-6 Dynascope Restoration Gallery When in January 2008 Company Seven acquired a used Criterion RV-6 Dynascope for our Museum Collection (see the article listed below) we deliberated about whether or not to disassemble, clean, strip, refinish the instrument to restore its appearance more to like new. When we learned about a collection of images taken by Mr. Tom McDonough who did this to his RV-6, we asked if he would permit Company Seven to create an article around his efforts and he was kind enough to give us permission to use his images in this article.

  • Experiencing Nova Scotia And Its Amazing Tides From Company Seven's Archives. An overview of how tides form, and an overview of the author's travels through Nova Scotia's Bay of Fundy and Minas Basin, then on to Halifax in June 2004. Well written and illustrated with some amazing photos.

  • Formulae and Guidelines Pertaining to Astronomical Telescopes, and Accessories

  • "The Green Lights Are Flashing For Johnny Carson" article by Gilbert Millstein with photograph by Curt Gunther in the 8 June 1963 issue of the weekly TV Guide Magazine. The late Johnny Carson came to the hobby of astronomy and accumulated several telescopes including the Unitron 114, a 60mm Achromatic Refracting telescope, pictured in this article. Over his tenure as host of "The Tonight Show" and in other ways he popularized the science of astronomy. He was formally recognized by the professional astronomy community when the asteroid "3252 Johnny" was named after him. This article is protected by Copyright. We obtained permission from TV Guide Magazine, LLC to scan and host this article from the original in our archives for the benefit of our readers and for display alongside the Unitron 114 in our museum collection. Please do not distribute this without permission. Download size is 5,675,333 bytes (an Acrobat ".pdf" file).

  • Insuring Telescopes, Accessories and Observatories Article explains the various insurance vehicles available to the consumer, recommendations about traveling with or transporting telescopes, and advice about when and how to file an insurance claim. This article includes a glossary of insurance terms as they apply in this article. Incidentally, we have never before seen an article on this subject researched and published elsewhere.

  • "Observatory Wiring & Utilities Guidelines" by Company Seven, Revision 9 July 2010. Complete eighteen (18) page color illustrated addendum to the factory instruction manuals for building dome or roll off roof style observatories sold by Company Seven. This contains recommendations for providing AC and DC power, signal wiring and conduit, lighting, backup power, lightning protection, security, maintenance. This is ideal information for electrical contractors detailing recommended arrangements, suggested components, and explanation of how to wire, install and secure components and condiuts. By Company Seven for use by our customers only, available by request, all rights reserved (2,639,050 bytes in Acrobat Reader ".pdf" format).

  • Parfocalizing an Ocular for use with a CCD Camera How to set an eyepiece so that it is at the same focus plane as that of a CCD camera. With this technique one can locate a target and focus a telescope, then attach a CCD camera being nearly at nominal focus for the camera.

  • Notes on Polar Alignment with Pole Finders by Ray Sterner.

  • Recollections of the NASA STS-61 First Hubble Space Telescope Servicing Mission It was fifteen years after working on this project that we had enough distance to see it from another perspective and write this article. Most of the older people on the team mentioned in this article or working on other parts of the mission, presently retired or not, should have seen enough time pass so that they too might smile and find something good to recall or relate to in this article. So before the memories are forgot this article recalls the brilliant engineers, our team leader and NASA management people who were critical parts of this project on the ground. The mission that earned the 1993 Collier Trophy, the mission that many people say saved NASA and the space program.

  • "Star Watch" Activities: Advice to Those Attending Article geared for the general public attending night-time observing activities with telescopes, such as those periodically hosted by many astronomy clubs.

  • "Star Watch" Activities: Advice to News Media Geared for news staff, or others who might wish to film or interview.

  • "The Twenty Best Industrial Designs Since World War II" article by Walter Dorwin Teague in the 23 May 1964 issue of the weekly magazine Saturday Review. Walter Dorwin Teague was an internationally acclaimed architect and industrial designer. Teague and his company designed aspects of aircraft interiors for Boeing including that of the famous 707. The Questar 3-½ telescope is mentioned alongside the Karman Ghia Coupe, Triton Sloop, Honda motorcycle, Boston Whaler, Porsche 904, Head skis, Wegner chair, and the Boeing 707. Here the Questar is item No. 10 in order of how these products came to Mr. Teague's mind. In the article Mr. Teague goes on to explain "Another answer to the person who says we can't produce fine craftsmanship in the US.A. Designed and built in the little Pennsylvania town of New Hope, this beautiful little telescope is the finest instrument of its kind in the world.". This article is protected by Copyright but we obtained permission to host this for the benefit of our readers - please do not distribute this without permission. Download size is 1,243,053 bytes (an Acrobat ".pdf" file).

  • "Ultraviolet Spectrum Primer" Illustrated article by Company Seven explaining the ultraviolet (UV) spectrum as it applies to photographing or imaging objects in the UV. The article explains the UV spectrum including UV-A, UV-B and UV-C. Imaging gear including lenses, films and filters.

  • The Uninterruptible Power Supply (UPS) And Determining Required Capacity The Uninterruptible Power Supply is a device that provides there will be no lapse of continuous AC power to the connected device(s) if the primary AC wall current (mains) is interrupted. Company Seven recommends the UPS even for the personal astronomical observatory where power may be required for critical shutdown operations; this can include closing the shutter of a dome and allowing time for an orderly shutdown and 'parking' of a telescope mount. In this article we provide a brief overview of the UPS and an explanation about how to select the capacity needed for your application.

  • PDF Icon "Uranomaniac 2001.1" Reprint of popular advertisement of ficticious Star Atlas made up by Company Seven in response to the announcement of "Uranometria 2000". Originally published in February 1989 "The C-VII Journal" (in Acrobat Reader ".pdf" format).


Explaining some of the many items on exhibit in our showroom or on-line from our archives. We will gradually add more on line for the enjoyment of customers who support Company Seven

  • Astro Kit Camera Drive article describing this compact "poncet" style tracking platform. These were sold as kits in the 1980's as a tracking platform for wide sky astrophotography. The unit illustrated was donated to the collection of Company Seven.

  • Bausch & Lomb Life Long Binoculars Catalog and 1934 Price Sheet, the complete forty-five (45) page illustrated booklet describing the Bausch & Lomb binoculars and field telescopes. You might know them for sunglasses and Contact lenses, but decades ago Bausch & Lomb, established in Rochester, New York, was a powerhouse: a preeminent manufacturer of optical glass, maker of binoculars, camera lenses, and other optics too. They, along with nearby Kodak and other manufacturers, set the tone for innovation and development of new technologies in optics and photography among other fields. Up to the time this catalog was published the Bausch & Lomb Company marketed to consumers however, it was also instrumental in supplying the United States military with optical instruments that would continue well throughout the coming World War II and beyond. Though by the 1950’s they had commenced exporting many of their U.S. based jobs to Japan thereby becoming among the first U.S. companies to sell their soul; they would never again regain their dominance or mystique in those fields.

    This booklet provides an insightful overview of the times as they relate to the marketing by Bausch & Lomb of their binoculars. This explains their properties including: differences of designs (Galilean versus B&L prism models), explanations of the Central and of Individual Focusing mechanisms, about magnifications and how they matter, judging clearness of field, alignment, and their stereoscopic effect. This also explains how these are constructed showing their layout, and with illustrated explanations how to select a binocular for the various typical uses. Then each model of B&L binocular is described and well illustrated including: 6x 30 mm, 7x 35 mm, 7x 50 mm, 8x 30 mm, 9x 35 mm, 10x 50 mm, and 10x 45 mm. The document also includes testimonials by naturalists, hunters, and Olympic sports team members. The numerous good quality photos showing people of this era, their clothing, etc. adds some additional interesting history context even beyond the optical subjects of the booklet. Content scanned from original in our archives in moderate resolution and provided by Company Seven as an Adobe pdf file (7,067,715 bytes). This is available on request only for those of our customers who have made it possible for Company Seven to survive and prosper over the decades.

  • Carl Zeiss Jena Feldstecher Und Zubehör Katalog (Carl Zeiss Jena Binoculars And Accessories Catalog), published in 1958, German language. Published by VEB Carl Zeiss JENA, of Democratic Republic of Germany. VEB Carl Zeiss JENA. Printed publication No. 50-047-1 - Lot number 37 15 13 10/20, 111-6-15 20 1058 5348 Ag 10 ยท 0589-58 DDR

    Moderate resolution scan of complete twenty-four (24) page color illustrated booklet describing the Carl Zeiss Jena (DDR/East Germany) consumer oriented binoculars, accessories, and monoculars product lines. Each model of binocular and monocular is described and illustrated including: 6x 30 mm Silvarem and Silvamar, 7x 50 Binoctem and Binoctar, 8x 30 Deltrintem and Deltrentis, 10x 50 Dekarem and Dekaris, and 15x 50 Pentekarem and Pentekar, and monoculars including the 8x 30 Deltrintmo, 6x 30 Simpsilv, 7x 50 Binoctarmo, 10x 50 Dekarismo, and 15x 50 Pentekarmo, 8x 21 Turmon, and 2.5x Tellup. Their accessories are explained as well. Article prepared for educational purposes, is helpful in comparing the technologies of the era compared to those of today and following the history of one of the world-s most important optical companies. Content scanned from an original in our archives, in moderate resolution and provided by Company Seven as an Adobe .pdf file (2,133,838 bytes) for Acrobat Reader versions 7 or later.

  • Celestron 8 article describing a 1970's version of the telescope that had a major impact on the history of amateur astronomy, particularly from the 1970's through the Comet Halley era when the 8 inch aperture Schmidt-Cassegrain telescope was among the most sought after new telescopes by those seeing a good start into the hobby. The unit illustrated was donated to the collection of Company Seven.

  • Criterion RV-6 Dynascope: these introduced many of us to visual astronomy In January 2008 Company Seven acquired a used Criterion RV-6 Dynascope for our Museum Collection. This is a 6 inch f/8 equatorial reflecting telescope originally sold new in December 1962 and yet this one remains uncommonly complete and original with original sales invoice and some documentation. Our article describes this RV-6 acquired by Company Seven, the production RV-6 models as they were changed over the decades, some history of the Criterion Manufacturing Co. who made this telescope, and insights into the evolution and marketing of these types of instruments from the 1950's through the peak of the space program, and into the 1980's.

  • Hasselblad UV-Sonnar f4.3/105 mm complete ten (10) page illustrated booklet describing the lens formerly made by Carl Zeiss. Is an insightful overview of applications for this specialized lens focused on ultraviolet photography. Techniques shown apply to forensics, law enforcement, artworks studies, medical, and other applications. Content scanned from original in our archives in moderate 200 dpi resolution and provided by Company Seven as an Adobe pdf file (27,163,363 bytes).

  • Meade Instruments Model 826C: a beautiful example of an 8 inch f/6 equatorial reflecting telescope on a German Equatorial Mount. The 8" Newtonian style telescope was a popular choice among astronomers who sought sufficient light gathering power for observing the brighter deep sky objects, but not at the higher costs commanded by the then popular Schmidt-Cassegrain comparatively compact telescopes. This telescope was retired to Company Seven's collection after Meade discontinued production of these telescopes in 1992.

  • Nikon Nikkor 300mm f/2 ED IF and Tochigi Nikon 300mm T2.2. In our tribute to rare Nikon ultra-telephoto lenses that remain unrivaled even today we have written this illustrated article where we discuss the development, optical and mechanical arrangements, and history of three versions of the Nikon 300mm f/2.0 ultra-fast telephoto lenses originally developed by Soichi Nakamura and Kiyoshi Hayashi. We focus on three variants: the Nikon's Nikkor 300mm f/2 ED IF lens, the Nikkor 300mm f/2 ED IF lenses as modified by Century Precision Optics, and the production by Nikon's 'Tochigi Nikon' factory of twenty new 300mm T2.2 lenses in 2004. An example of each is in our collection and some are displayed at our showroom museum. Contents copyright Company Seven and respective contributors.

  • Optical Techniques: A Brief History of A Brief Company About the company, with information and images of a Quantum 6 telescope in Company Seven's museum collection.

  • "Questar 3-½ Mid Production Telescopes: 1954 and 1955" Illustrated article describing the original production Questar telescopes made in 1954 and 1955 with some mentions of changes that followed. From Company Seven's Museum Collection.

  • "Questar 3-½ Mid Production Telescopes: from 1956 to the late 1960's" Illustrated article describing a the production Questar telescopes made between 1956 with some mentions of changes that followed and comparisons with earlier production telescopes. From Company Seven's Museum Collection.

  • "Questar Seven S/N P-7-378-DP: A Restoration Mini-Epic!" The story of the restoration of an original Questar 7 telescope and Fork Mount. From Company Seven's Museum Collection.

  • “STATICMASTER® Static Control Brushes” The story of the development, evolution, and marketing of these brushes that incorporate an encapsulated Polonium 210 radioactive element to neutralize static. This article goes into some discussion of the propagation in the early 20th century of radioactive materials for the consumer market, including the Radium Luminous Material Corporation “UNDARK” glow-in-the-dark (luminescent) paint, marketed from 1917 to 1938. This article was put together in part from Company Seven’s archives that include literature and a collection of Nuclear Products Company Staticmaster” anti-static brushes with their original packaging and associated documents. As over time we add older brushes to our exhibit and learn even more about these, then we will update our article accordingly. From Company Seven's Museum Collection.

    Complimenting Company Seven for yet another journalistic coup, we were advised “yours must certainly be the most definitive and comprehensively researched article ever hosted about old products that hardly anybody, likely including NRD, appreciate or care about anymore.”

  • Unitron Notes & Interesting Articles Index articles and documents related to the history and technology of Nihon Seiko telescopes. These were marketed between 1952 and 1992 under the trade names Unitron in the USA, and Polarex in Europe and most Commonwealth nations. From Company Seven's Museum Collection.

  • Unitron Model 114 - 2.4" (60mm) Achromatic Telescope Illustrated article describing an original Unitron 2.4 inch (60mm) achromatic refracting telescope. This was sold as the Model 114 with altazimuth mount with tripod, and its accessories. This article also goes into the history of Unitron telescopes and of the industry over the years when Unitron was selling telescopes. From Company Seven’s Museum Collection.

  • Unitron Model 142 - 3.0" (75mm) Achromatic Telescope Illustrated article describing an original Unitron 3 inch (75mm) achromatic refracting telescope with German Equatorial mount with tripod, and its numerous optional accessories. In fact this telescope is so well accessorized that it actually surpasses the equipment level as provided with the Model 145 as those were sold. This article also goes into the history of Unitron telescopes and of the industry over the years when Unitron was selling telescopes. From Company Seven’s Museum Collection.

  • Unitron Model 132 - 4.0" (102mm) Achromatic Telescope. Illustrated article describing an original Unitron 4 inch (102mm) achromatic refracting telescope with German Equatorial mount with tripod, original wood cases, and its numerous optional accessories. The instrument we exhibit was marketed overseas as the Model 132, while a version similar to this was marketed in the USA as the Unitron Model 152 telescope. This particular telescope was among the last production Unitron telescopes, sold in the early 1980’s and with a distinctive multi-coated objective lens and uncommon folding wood tripod legs. This was acquired by Company Seven in an amazingly complete configuration, in near new condition from Xavier Debeerst, a collector and amateur astronomer in Belgium who owns the Arcturus Observatory and Anamorfose Curiosa. This article also goes into the history of Unitron telescopes and of the industry over the years when Unitron was selling telescopes. From Company Seven’s Museum Collection.

  • Unitron Model 220 - ASTRO-CAMERA Illustrated article describing an original Unitron sheet film camera specifically sold for astrophotography, but also capable of terrestrial work with these telescopes. From Company Seven's Museum Collection.

  • U.S. Navy Mark 37 9x 63 Binocular Of World War II illustrated article describing the 9x 63 binoculars issued by the US Navy Bureau of Ordnance (BU.ORD) Naval Gun Factory Optics Shop during World War II. This explaining why these were designed for Captains and Gun Control Officers of the Battleships and Cruisers. We also explain how these were developed and manufactured during the war in part by modifying existing Bausch & Lomb made U.S. Navy 7x 50 binoculars. The article features a U.S. Navy Mark 37 9x 63 Binocular binocular that was added to our exhibit of antique U.S. Navy optical instruments in February 2016. From Company Seven’s Museum Collection.

  • U.S. Navy Mark XLIV 7x 50 SARD Binocular Of World War II illustrated article describing the 7x 50 binoculars issued by the US Navy Bureau of Ships (BUSHIPS) during World War II, explaining how these were designed, contracted and manufactured during the war. The article features an uncommonly complete and pristine SARD Mark XLIV Mod. 0 binocular that was added to our exhibit of antique US Navy optical instruments in February 2016. From Company Seven’s Museum Collection.

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Contents Copyright 1963-2016 Company Seven and respective contributors - All Rights Reserved